Some defects cost a little more than the original work to repair. These five cost many times more, because fixing them means removing finished construction.
Not all defects are equal. A paint mark costs the price of a litre of paint and an hour. A wet room membrane that was never tested costs the removal of a finished bathroom, the ceiling below, and the joinery that was fitted after it. This example puts illustrative numbers against five common failures, calculates what each costs to put right as a multiple of the original work, and shows why inspection at the right moment is the cheapest money on a project.
The situation
An illustrative villa project is reviewed after handover. Five failures are identified, each of which was preventable by an inspection that would have taken under an hour at the right stage. For each, the original cost of the work is compared with the cost of putting it right once the building is finished, using illustrative figures to show the ratio rather than to quote a market price.
Assumptions (illustrative)
- Wet room waterproofing: original work 3,500 riyals; rectification including strip out, retiling and the ceiling below 28,000 riyals.
- Missing mesh at plaster junctions, whole villa: original 1,200 riyals; rectification cutting out, meshing and redecorating 22,000 riyals.
- Trench reinstatement under the drive: original 2,000 riyals; rectification breaking out and relaying paving 25,000 riyals.
- Concealed pipework never pressure tested, one leak: original cost of testing 800 riyals; rectification tracing, opening the wall and making good 18,000 riyals.
- Insulation gaps behind cladding on one elevation: original 4,000 riyals; rectification access, removal and refixing of panels 60,000 riyals.
- An illustrative inspection cost of 500 riyals per hold point.
Step 1: Calculate the multiple for the wet room membrane
28,000 divided by 3,500 gives a factor of 8. The rectification costs eight times the original work, and most of that is not the membrane itself but the finished tiling, the sanitaryware, the ceiling below and the time the room is out of use.
The membrane is cheap and everything on top of it is not. This is why the flood test before tiling is the highest value single inspection in a residential build.
Step 2: Calculate the multiple for missing plaster reinforcement
22,000 divided by 1,200 gives a factor of about 18.3. The mesh across junctions is one of the cheapest materials on site, and the repair involves cutting out plaster along every crack line, reinstating and redecorating entire rooms.
The highest multiples come from tiny items buried under large areas of finish. A roll of mesh and twenty minutes of inspection prevents a repair that touches every room in the house.
Step 3: Calculate the multiples for the trench and the untested pipework
Trench reinstatement: 25,000 divided by 2,000 gives a factor of 12.5. Untested pipework: 18,000 divided by 800 gives a factor of 22.5, the highest in the list, because the original item was not even construction work but a test.
Skipping a test produces the worst ratio of all, since the avoided cost was almost nothing and the consequence is opening finished construction to find a leak whose position is unknown.
Step 4: Calculate the multiple for the facade insulation
60,000 divided by 4,000 gives a factor of 15. The insulation is a modest material cost, while the rectification is dominated by access to the elevation and the removal and refixing of panels that were never designed to come off easily.
On a facade, access cost dominates everything. This is the argument for the photographic hold point before cladding, which costs nothing but attention.
Step 5: Total the exposure and compare it with the inspections avoided
Original work totals 3,500 plus 1,200 plus 2,000 plus 800 plus 4,000, which is 11,500 riyals. Rectification totals 28,000 plus 22,000 plus 25,000 plus 18,000 plus 60,000, which is 153,000 riyals, a factor of about 13.3 overall. The five hold points that would have caught them, at 500 riyals each, total 2,500 riyals.
2,500 riyals of inspection against 153,000 riyals of rectification is a ratio of about 61 to one. That ratio, rather than any argument about diligence, is the business case for hold points.
Step 6: Identify what the five have in common
Each failure is a thin, cheap layer that is covered by expensive finished work: a membrane under tiles, mesh under plaster, compacted fill under paving, a test before plaster, insulation behind cladding. In every case there is exactly one moment when inspection is possible and after that moment it is not.
The pattern is the lesson. Put the hold points where a layer is about to be covered, and the ones that matter identify themselves without any need for judgement about which trade is trustworthy.
What changes the answer
- Access cost: anything on a facade or a roof multiplies rapidly because of scaffolding or access equipment.
- Extent: a failure repeated in every room costs far more than the same failure in one place.
- Timing of discovery: inside the defects liability period the contractor may carry it, afterwards the owner does.
- Disruption: a repair in an occupied house carries costs beyond the construction work itself.
- Consequential damage: a leak that reaches joinery, electrics or a neighbouring unit multiplies the figure again.
What the numbers tell you
- The worst ratios come from cheap layers hidden under expensive finishes, not from expensive mistakes.
- Skipping a test gives the highest multiple of all, because the avoided cost was almost nothing.
- Hold points belong at the moment a layer is about to be covered, which is when inspection is still possible.
- Access cost dominates facade and roof rectification, so those hold points are worth the most.
- A handful of inspections priced in hundreds protects work priced in tens of thousands.
Limits of this example
Every figure above is an illustrative assumption used to show the method, not a quote, valuation or market rate. Costs, rates, fees and regulations change and must be confirmed with the relevant authority, lender or supplier before you commit.
Domira builds and supervises projects across Saudi Arabia, and this is the level of detail its site teams work at. Send the drawings or the site, and Domira will tell you what the specification has to say before anyone prices it.
Frequently Asked Questions
Why are hold points placed just before something gets covered up?
Because that is the last moment at which the work can be seen. A hold point stops the sequence until an inspection is accepted, so it is positioned where inspection would otherwise become impossible: before a pour, before a membrane is tiled over, before backfilling, before plastering over services and before cladding is fixed over insulation.
Which construction defects are most expensive to fix after completion?
Those where a cheap hidden layer sits beneath expensive finished work or behind inaccessible construction: waterproofing under a finished wet room, reinforcement and cover inside concrete, compacted fill beneath paving, insulation behind a facade, and untested concealed services. In each case the repair means removing completed work rather than replacing the failed item.
Is it worth paying for independent inspection on a villa build?
The arithmetic usually favours it heavily, because a small number of inspections at the right moments protects work worth many times their cost. The value comes from timing rather than from frequency: inspections placed where a layer is about to be covered are worth far more than a general walk round after the event.
How do I decide where to put inspection hold points?
Walk through the construction sequence and mark every point where something is about to be permanently covered or made inaccessible. Those points identify themselves: before a pour, before backfilling over waterproofing, before plastering over services, before tiling over a membrane, before cladding over insulation. Write them into the inspection and test plan so they are contractual rather than optional.
Have a Property Question?
Domira can help you navigate property, financing and investment decisions in Saudi Arabia. Speak with our team for an initial consultation.
